Seasonal distribution and correlates of transparent exopolymer particles (TEP) in the waters surrounding mangroves in the Sundarbans

Chowdhury, Chumki; Majumder, Natasha; Jana, T. K.

doi:10.1016/j.seares.2016.01.004

Cited by 13 publications

(13 citation statements)

References 72 publications

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“…This hypothesis is reinforced by the positive relationship we found between [TEP] and [Si] and the negative relationship with diatom abundance (Table 2). In this study, our results rather confirm that, in the Seine estuary, healthy phytoplankton produce less than stressed or dying phytoplankton as already demonstrated in both field and laboratory studies (Liu and Ramaiah et al 2001;Klein et al 2011;Chowdhury et al 2016), confirmed by the negative relationship between [TEP] and F V /F M (Table 2). This study also confirms the previously demonstrated strong relationship between TEP and, SPM, turbulence and mixing (Beauvais et al 2006;Malpezzi et al 2013;Morelle et al 2017)which favor TEP production by diatoms but also disruption of aggregates in the water column.…”

Section: 2tep Dynamics and Distribution In Relation With Biologicasupporting

confidence: 91%

“…However, most research on EPS in estuaries to date has focused on their production by microphytobenthic communities and only a few authors have studied EPS and TEP dynamics in the estuarine water column (Wetz et al 2009;Annane et al 2015;Morelle et al 2017). As the different phytoplankton groups and species do not have the same rates of polysaccharide production, chla concentration, sinking rate or photosynthetic efficiency, spatial and temporal variations in phytoplankton size and community structure could explain the previously described absence of correlation between EPS and phytoplankton dynamics (Garcia 2002;Corzo et al 2005;Klein et al 2011;Chowdhury et al 2016).…”

Section: Accepted Manuscriptmentioning

confidence: 98%

“…However, although estuaries may present very high concentration of TEP, it is regularly reported that no direct correlation can be found with the phytoplankton dynamics such as the concentration of chlorophyll a (chla) or primary productivity (Garcia 2002;Corzo et al 2005;Klein et al 2011;Chowdhury et al 2016).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Dynamics of exopolymeric carbon pools in relation with phytoplankton succession along the salinity gradient of a temperate estuary (France)

Morelle

Schapira

Françoise

et al. 2018

Estuarine, Coastal and Shelf Science

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In parallel to phytoplankton community dynamics, transparent exopolymeric particles (TEP) and exopolymeric substances (EPS) were investigated along the salinity gradient of a temperate estuary (Seine estuary, Normandy, France) over the course of a year. The phytoplankton community was mainly dominated by marine diatom species (especially Skeletonema sp., Nitzschia sp., and Paralia sulcata) associated with a spring bloom of pico-eukaryotes and the development of Cryptophyceae in summer. The decreases in species richness and salinity were correlated along the estuary and a significant exponential relationship between species richness and primary production was identified. Concentrations of TEP and EPS (soluble and bound carbohydrates) are highly dynamic in this estuary and can reach respectively 69 mgC L −1 , and 33 mgC L −1. TEP distribution was mainly related to physical factors (hydrodynamics, maximum turbidity zone formation and sediment resuspension) probably produced by stressed or dying phytoplankton, while EPS appeared to be excreted during the phytoplankton spring bloom. Soluble and bound EPS appear to be related to Skeletonema sp. and Cryptophyceae occurrences. This paper presents the dynamic pattern of these carbon pools, which play an important role in the trophic network and influence the flocculation processes involved in the fate of both organic and inorganic matter. Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site.

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Section: 2tep Dynamics and Distribution In Relation With Biologicasupporting

confidence: 91%

Section: Accepted Manuscriptmentioning

confidence: 98%

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Dynamics of exopolymeric carbon pools in relation with phytoplankton succession along the salinity gradient of a temperate estuary (France)

Morelle

Schapira

Françoise

et al. 2018

Estuarine, Coastal and Shelf Science

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“…6). Our results are comparable with those of Chowdhury et al (2016) and Klein et al (2011), who reported low concentrations of TEP during maximum abundance of phytoplankton and higher concentrations during phytoplankton senescence which, in estuaries, is especially important in the MTZ. Moreover, our TEP:chla ratios were inversely correlated with chla and productivity.…”

Section: Dynamics Of Eps In the Seine Estuary In Relation With Biologsupporting

confidence: 90%

Dynamics of phytoplankton productivity and exopolysaccharides (EPS and TEP) pools in the Seine Estuary (France, Normandy) over tidal cycles and over two contrasting seasons

Morelle

Schapira

Claquin

2017

Marine Environmental Research

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Exopolysaccharides (EPS) play an important role in the carbon flux and may be directly linked to phytoplankton and microphytobenthos production, most notably in estuarine systems. However the temporal and spatial dynamics of estuarine EPS are still not well understood, nor how primary productivity triggers this variability at these different scales. The aim of this study was to investigate the primary productivity of phytoplankton and EPS dynamics in the Seine estuary over a tidal cycle in three different haline zones over two contrasted seasons. The other objectives was to investigate the origin of pools of soluble carbohydrates (S-EPS) and transparent exopolymeric particles (TEP) in phytoplankton, microphytobenthos or other compartments. High frequency measurements of productivity were made in winter and summer 2015. Physical and chemical parameters, biomass and EPS were measured at hourly intervals in sub-surface waters and just above the water sediment-interface. Our results confirmed that high frequency measurements improve the accuracy of primary productivity estimations and associated carbon fluxes in estuaries. The photosynthetic parameters were shown to be strongly controlled by salinity and by the concentrations of suspended particle matter at the smallest temporal and at spatial scales. At these scales, our results showed an inverse relationship between EPS concentrations and biomass and productivity, and a positive relationship with sediment resuspension. Additionally, the distribution of EPS appears to be linked to hydrodynamics with the tide at daily scale and with the winter at seasonal scale. At spatial scale, the maximum turbidity zone played an important role in the distribution of TEP. Our results suggest that, in the Seine estuary, between 9% and 33% of the S-EPS pool in the water column can be attributed to phytoplankton excretion, while only 0.4%-1.6% (up to 6.14% in exceptional conditions) originates from the microphytobenthos compartments. Most EPS was attributed to remobilization of detrital carbon pools in the maximum turbidity zone and in the sediment or allochthonous origin.

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“…According to authors the diversity of coastal marine species may have been associated with the allochthonous phytoplankton species from the estuary. The Bay of Bengal and the associated river estuaries drain to coastal area of Bay of Bengal are characterized by dynamic environment [25]. The two study sites of the present investigation represent two different estuarine environments on the basis of natural input and anthropogenic stress.…”

Section: Introductionmentioning

confidence: 99%

Comparison of phytoplankton community structure in two tropical estuaries of East Coast of India

Chowdhury¹

2020

Self Cite

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Phytoplankton community of two tropical river estuaries of the North-east coast of India was different due to dissolved nutrients concentration in those estuarine waters. The first study site was the Saptamukhi river estuary which is located in the Indian Sundarban (inside mangrove forest) and the second study site was Mahanadi estuary located in Orissa coast (adjacent to industrial and coastal fishing zone). The Saptamukhi estuary was mostly devoid of any anthropogenic influence and here the nutrient source was auto-generated. In Mahanadi estuarine water, the source of the major nutrients was industrial effluent and fishing waste. The Saptamukhi estuarine water had less dissolved phosphorus concentration but huge dissolved nitrogen available for phytoplankton uptake. A sufficient amount of dissolved silicate encouraged the diatom growth over other phytoplankton groups here. Due to the availability of the high amount of dissolved phosphorus and the low amount of dissolved nitrogen in the Mahanadi estuary the phytoplankton community was a mixed population of Bacillariophyceae, Cyanophyceae, Chlorophyceae and Dinophyceae and seasonal Chlorophycean bloom observed during the study period. In both the estuarine water primary productivity was high but the community respiration was higher and the estuaries were heterotrophic. Monsoonal runoff from land considerably changed the community in both estuarine water. Dissolved silicate concentration in both the estuarine water was sufficient for Diatom growth. Dissolve inorganic nitrogen and dissolved inorganic phosphate ratio played a major role for the community change of phytoplankton in two estuarine waters.

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Seasonal distribution and correlates of transparent exopolymer particles (TEP) in the waters surrounding mangroves in the Sundarbans

Cited by 13 publications

References 72 publications

Dynamics of exopolymeric carbon pools in relation with phytoplankton succession along the salinity gradient of a temperate estuary (France)

Dynamics of exopolymeric carbon pools in relation with phytoplankton succession along the salinity gradient of a temperate estuary (France)

Dynamics of phytoplankton productivity and exopolysaccharides (EPS and TEP) pools in the Seine Estuary (France, Normandy) over tidal cycles and over two contrasting seasons

Comparison of phytoplankton community structure in two tropical estuaries of East Coast of India

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